By now, you will have heard at least something about Windows 10, the next iteration of Microsoft's OS that aims to create a unified experience across all the devices it'll eventually inhabit: everything from PCs and laptops to tablets and phones. Microsoft already released several preview builds for computers, and now the first Windows 10 Technical Preview is available for phones. You're highly unlikely to want to install this buggy early build on your daily driver, but don't sweat it. I've got just the phone for the job: a Lumia 630, which happens to be one of the few compatible devices at the moment. So let's take a look at what's new, and what's still to come.